Abstract:

For the reef carbonate reservoirs, the vxdarious lithology and pore types and the complex throat structure are the fundamental factors of complex pore-permeability relations, which greatly affect the accuracy of the reservoir parameters, especially the logging interpretation of permeability, and bring great difficulty to the reservoir evaluation. First, the reef-flat facies reservoir of Feixianguan Formation in X Gas Field is took as an example to define the amplitude difference of the logging curve by the change characteristics of density curve and acoustic time difference curve on the basis of clarifying the four property relationship of the reservoir and according to the data of core analysis, casting thin section, mercury injection analysis and logging. And than, the cross plot of the new parameters and the density curve is made to establish the pore type identification template by the multiple regression analysis method. At last, the reservoir parameter interpretation model based on the pore type identification is established to make the accurate interpretation of the parameters of the reef-flat facies poro us reservoir. The interpretation results show that the logging interpretation model with pore identification ability can significantly improve the logging interpretation accuracy of reef-flat facies reservoir, and can provide technical reference for the logging interpretation of the same reservoir type.

Key words: reef-flat facies reservoir, carbonate, pore type, logging interpretation model, reservoir evaluation